Fluid-pressure brake



Aug. 21, 1928.

Filed Jan, 27, 1927 A WX sa' [L 4/ lI lNvENToR i OLYDE O. FARMER A-rToRNaY Patented Aug. Y 21 1928-.

i AUNITED STATES cLYDn o. FARMER, or PITTSBURGH, rnNNsYLvANIA, AssIGNon r'ro THE wnsTING- Trousny Ain BRAKE COMPANY, or WILMERDI'NG, PENNSYLVANIA, A conronA-.

' l TION .OF PENNSYLVANIA.

. :enum- PRESSURE BRAKE.

Aplication sied January 27, 1927; `serial Np.l 163,944.

This invention lrelates to fluid pressure brakes and more particularlyto a locomotive brake equipment AAThe usual standard locomotive brake 5 equipment 'includes' a distributing valve de'- vice,V an automatic-brake valve device, vand an indpendent brake valve device, and the locomotive brakes are controlled by the Voperation of Vsaid brake' valve devices througha distributing valve release pipe and an application Vcylinder pipe, Which connects valve'device. vWith both of the brake valve devices in running position, theapplication cylinder of the distributing valve device is connected to the `atmosphere through the distributing valve releasepipe, While the application cyi the brake valvedevices to the distributing linder p'pe connection lis lapped at each' brake valve device.

e 35. nect'on from the application cylinder of the distributing valve device to the Adistributing valve release pipe may be closed, so that'if fluid under pressure should leak into said application cylinder, there will be a tendency for the fluid pressure to build up therein and thus cause an application of the brakesvvhen not intended.

The principal object/of my invention is to p'rovidejmeans adapted to Warn the operator when the Vloccnnotive brakes are beginning to apply, under circumstances such as above described. v

In'the accompanying drawing, the single `figure is a diagrammatic vievv, partly in section, of a locomotiveV fluid pressurebrake equipment, with myy invention embodied therein. w As shown in the drawing, the brake equipment may comprise an automatic brake valve device 1, having associated therewith a Whistle device 2, an independent brakel valve deviceS, a distributing valve device 4, a

feed valve device 5 and a main reservoir 6. The automaticbrakelvalve device 1 `may comprise acasing having a .chamber containing the usual rotary valve 7, adapted to be operated by a handle 8. Y

According to my invention, the brake valve casing also containsy a ilexible` dia'` phragm 9, forming a chamber 10, atl one side, connected through a choke'plug 11 vvith posite side kconnected by passage 14: to the atmosphere and Acontaining a convex plate 15 engaging' said diaphragm. Said casing also has a chamber 16 containing a valve 17, subpassage 12, and a chamber 13 at the opject on one side to Vthe pressure of a spring 18 and having a stem 19 adapted to extend through aychamber 22 and a bore inthe partition Wall separating the chamber l22 from chamber 13. The stein 19 is adapted to engage the upper face of the convex plate 15, The `upper portion 2O oi' the valve stem 19 is fluted, While the lower-portion'2lfhas` a neat sliding lit in said bore..A

The independent brake valve device 3 comprises a casing having av chamber con taining the usual rotary valve 23 adapted to 1 be Operatedby a handle 2d. f

`The distributing valve'device 4 comprises a casing having an application cylinder 25 in constant communication through passage 26 with the application cylinder pipe 27, and containing an application piston 28, adapted to operate valvestnot shown) for controlling the applic-ation and release of Y the locomotive brakes. 1

Also contained in the casing `of the distributing valvev device 4r is the usual equaliz ing slide valve 29 adapted to be operated by Van equalizing piston (not shown).

inV operation, With the braken valve handles 8 and 24 in running yposition and With the equalizing slide valve 29 0f the -(viistributing valve device 1in release position, the. Vapplication cylinder 25 ofjsaid device is connected with the atmosphere by Way ofy passages 26 and' 30,*jcavity 31 in the equalizing slide valve 29,V passage 32, the7^ distributing valve release pipe 33, cavity -34 in the rotary valve 23 oi the independent brake valve device 3, pipe 35, passage 36in the automatic brake valve device 1, cavity brakes.

37 in they rotary valve 7 Vand .atmospheric exhaust port 38. The application cylinder pipe 27, in constant communication with the application cylinder 25 Vthrough passage Fluid under pressure from the main reservoir 6 flows through pipe 40 Ato the l feed valve device 5, which operates in the usual manner to supply'fluid'. at the reducer pressure Acarried in the brake pipe. Fluid at the reduced pressure then flows through'l pipe 41, passage 42 in the automatic" brake valve device 1, cavity 43 in the rotary valve 7 and passage 44 to the brake pipe 45, charging said brake pipe.

Fluid at the reduced pressure passage 46 and into valve chamber 16.

'It for any reason, the equalizing slide valve 29 ofthe distributing valvedevice4 should creep toward service position whilethe brake valve devices are in ruiming po]- sition, communication between. passage and passage 32 will be cut off, so` that any leakage of fluid under pressure into the application cylinder 25 tends to .build up a.

pressurein the face ofthe application pis# ton 28 and thus cause movement of said piston so as to cause an application of the Upon an increase in pressure in the appli'-k V cationfcylinder V25, however, as yabove `described, said cylinder being connected ythrough the application 'pipe 27, passage 12, and choke plug 11, to chamber l0 at one side of the diaphragm 9 in the .automatic brake valve device, a corresponding pressure builds up inl diaphragm chamber 10, and since the diaphragm ychamber 13 is Connected to the atmosphere through passage 14, the diaphragm is operated to open the. valve 17. fluid under pressure is supplied from chamber 16 to chamber 221and thence through passage 47 to. the whistle device 2, .which produces a sound by the flow of fluid under pressure through itto the atmosphere, in the wellV known mannen f Chamber 13 is connected to theatmosphere through passage 14, so that in case fluid under pressure leaks lip'romchamber 22 Vpast the sliding lit of the lowerportion 21 of the vvalve stem 19 and into chamber 13, said leakage cannot build up a 'pressurel .therein to act upon the diaphragm 9.

The diaphragm 9 will operate f to open the valve 17 at a pressure of fluid in chamber 10 less than that required to operate the application piston 28 of the distributingy valve device 4. Thus the whistle 28 Will also flows through cavity 43 in the rotary' valve 7 to' Said valve being opened,r

.Pressure in 3. Ina fluid tion with a locomotive brake equipment in# f cluding a distributin blow before the locomotive brakeszstart to apply When "the operator is thus warned-of an undesiredpressure l build-up in the applical* tion cylinder of the distributing valve de.

vice, Ahe can move the independent brake valve hand1e24 so as to connect the appli'- ycationy cylinder 25 through the application cylinder pipe l27 directly to the atmospherey and thus he is euabledto prevent the loco? motive vbrakeslfrom being applied.

.Wheii'an applicationof locomotive and train brakesy is made by operation of `the automatic brake valve device inthe usual the rotary 'valve 7 to' passage 46 is cutoff, so that even though lthe diaphragm'Q is manner, communication vfrom cavity 43015180 operated to opent'he valve 17, 'there being no 'supply' `oi fluid Aunder pressure to the valve chambenl, yno fluid can be supplied to the Whistle 2 to operate same.

if um diaphragm 9 Should become' rupg,

tured, then when an application of' `,the brakes' is made, leakage from the/applica# tion cylinder. of the` distributing valve de-k viceto chamber' 13 andftlienc'e to atmosphere through passage" 14 can take' place, V which will tend to release the locomotive brakes.

-Tliechoke plug lli'nterposed between ythe application cylinder pipe and diaphragm chamber' 10 reduces the rate of saidleakage to a loW degree, vsofa'sto .prevent animmediate release of thelocomotive brakes, when the independent brake valvel handle`24 is inA running position. Furthermore, s'aid choke permits an operator to'maintain the brake cylinder f pressure against thev leakage ythrough said` choke, Vby the movement of lthe independent brake valve device' to` ap- ,plicationposition.H f

. Having now described myfinvention, what claim as new andy desire to secure by Letters Patent, is 'y i 1.."[1'1r alfluid pressure brake, the combination with a llocomotive Vbrake yequipment in- Acludingfa distributing valve device having an application cylinder 'and abrake valve device, of means incorporated in saidbrake.

valve device for Warningthe engineer when the" pressure iny said cylinder kis uninten' ytiona'lly builty up.

2. AIn a luidpressure brake, the 'combinai tionvvith a locomotive brake equipment'in- V ciudnfig a dis'tributingyvalve device havingy an application cylindery'and a brake valvev device, of' means yconnected directly to said cylinder and operated by'an "increase in said` cylinder lfor AWarning the engineer. v

pressure brake,fthe combinarv'independently of the position of said brake valve devicejand operated by an increase in pressure in said cylinder for Warning the engineer of suchincrease.

4. In a liuid pressure brake, the combination With a locomotive brake equipment including a distributing valve device having an application cylinder and a brake valvel device, of a leXible diaphragm incorporated in said brake valve device and subject to the pressure of vfluid in said cylinder, and a valve operated byr said diaphragm uponan 'increase in pressure in said cylinder for Warning the engineer of such increase in a pressure.

yan application cylinder and a brake valve device,r of a ilexible diaphragm incorporated in saidbrake valve device and subject to the pressure oflluid in said cylinder and on the opposite sideto atmospheric pressure, a Warning device, and a valve operated by said diaphragm uponvan increase in pressure in said cylinder orefecting-the operation of said Warning device;

VIn testimony whereofI have hereunto set my hand.V l

CLYDE c. FARMER, 

